Where does Tungsten come from, Daddy?

Mining Tungsten Technical 3D Animation
IR PR Presentation Castilla y Leon Spain Ormonde Mining Plc
This video is a little long (almost ten minutes) and, if you aren't in the tungsten business, rather boring, until you find out that the people who made this video just sold this mine for thirty times what they paid for it three years ago. That's kind of impressive. Of course, there are plenty of old, tapped out mines that aren't worth a plug nickel, and if you paid $1 for it and then sold it for $30, well, $30 is thirty times what you paid for it. Somehow I don't think that is the case here.

Salamanca Tungsten Mine

     Could it be that they were able to model the ore deposits in this mine, and then use their computer models to convince someone of it's worth? Could be that no one knew until they came in and performed a careful, analytical assessment.

Update November 2015. Replaced missing video with different one. Similar subject matter, may even be the same mine. Added picture.
Old YouTube video ID: gKxij8y5A4o, if you want to dig for clues. From Almonty: The Tungsten Outsiders Are Back, a story on the Metal-Pages blog, which has vanished.